If you can - please help me with a worked solution to this question!! shows a va

Question

If you can - please help me with a worked solution to this question!!

shows a variant of the class AB circuit of Fig. 13.30. Assume that all four transistors are matched and have beta = 100. For v1 = 0, find the quiescent current in Q3 and Q4, the input current i1, and the output voltage vo. Since the circuit has perfect symmetry, the small-signal performance around v1 = 0 can be determined by considering either the top or bottom half of the circuit only. In this ease, the load on the half-circuit must be 2RL, the input resistance found is 2 Rin, and the output resistance found is 2Rout. Using this approach, find Rin, vo/vi, and Rout (assuming that the circuit is fed with a zero-resistance source).

Explanation / Answer

chapter 13.31 6th edition

both transistors are in saturation==>Ipeak VI=VM==>VM=3.6/2-1.8/2=0.9 V

I=1/2*kn*W/L)n*(VM-Vin)2==>VM=3.6/2==>kn'=300 A/V2==>(W/L)n=1.8

Vin=0.5 V==>Ipeak=1/2*300E-6*1.5*(1.8/2-0.5)20.000036 A or 36 A

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